If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

It's a pleasure to officially introduce the VAC Motorsport stroker kit for the S65 V8 in the E9X (E90,E92,E93) M3. For those who want big naturally aspirated horsepower with the M3 this is the way to go. How much power is possible? Well, a race build with 13.5:1 compression pistons as shown in one of the dyno graphs below indicates 600+ naturally aspirated horses is possible. That is with 100 octane and a Pectel ECU to control the motor on 100 octane with 4.4 liter displacement. Now imagine that motor with some Schrick cams in the mix.

VAC has several options and combinations available. Want to keep the stock compression ratio at 12.0:1 for a street car? No problem. Want low compression pistons for a forced induction application? You got it. Want a 3.5 liter crank to drop the stroke to rev the motor to the moon for hill climb applications? Yep, they can help you there too.

CP or Mahle piston options are available. VAC can also supply Schrick cams as the first graph below shows a 12.5:1 4.4 liter S65 motor with 284/292 cams putting out over 500 horsepower from 7000 rpm to redline. Also talk about an impressive torque curve being held through the rev range with the cams and stroker crank. That's how it's done folks.

From here you can buy the kit 2 ways:
1. With drop in Mahle pistons for stock bore. Buy here

2. With CP pistons and Darton sleeves. Buy here This requires a top level machine shop to fit the sleeves. We offer this service on our all new Centroid for the highest level of accuracy and consistency. PM for more info.

Bonus: 4.6L capability! With these sleeves you can go to a 94mm piston, combined with the stroke yield a stout 4.6L S65.

We generally always have cranks and rods in stock. We often have pistons in stock as well, though we run through these quicker so there may be a 3-10 week delay depending on manufacturer and demand.

For those in a rush, we offer up to a 3 day expedite on CP Pistons. :-) No expedite on Mahle pistons.

We have sold these to street, circuit, hill climb and rally clients. With and without sleeves. Low compression, high compression - the sky is the limit.

Side note: We will have our 3.5L S65 cranks in stock soon. Another thread will follow ;-)

Sounds awesome -- I remember a few months ago you had mentioned a VAC Stroker + VF Engineering Supercharger kit combo, just was wondering if there's any more details on this now that VAC's released their stroker kit

It's a pleasure to officially introduce the VAC Motorsport stroker kit for the S65 V8 in the E9X (E90,E92,E93) M3. For those who want big naturally aspirated horsepower with the M3 this is the way to go. How much power is possible? Well, a race build with 13.5:1 compression pistons as shown in one of the dyno graphs below indicates 600+ naturally aspirated horses is possible. That is with 100 octane and a Pectel ECU to control the motor on 100 octane with 4.4 liter displacement. Now imagine that motor with some Schrick cams in the mix.

VAC has several options and combinations available. Want to keep the stock compression ratio at 12.0:1 for a street car? No problem. Want low compression pistons for a forced induction application? You got it. Want a 3.5 liter crank to drop the stroke to rev the motor to the moon for hill climb applications? Yep, they can help you there too.

CP or Mahle piston options are available. VAC can also supply Schrick cams as the first graph below shows a 12.5:1 4.4 liter S65 motor with 284/292 cams putting out over 500 horsepower from 7000 rpm to redline. Also talk about an impressive torque curve being held through the rev range with the cams and stroker crank. That's how it's done folks.